1. 发送 SMS
在开发 Web 或者移动应用的时候，经常会遇到需要发送 SMS 给用户，或者因为登录原因，或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。
为了使用任何的语言发送 SMS，需要一个 SMS gateway。大部分的 SMS 会提供一个 API，这里是使用 MSG91 作为 SMS gateway。
<?php

function send_sms($mobile,$msg)
{
    $authKey = "XXXXXXXXXXX";
    date_default_timezone_set("Asia/Kolkata");
    $date = strftime("%Y-%m-%d %H:%M:%S");
//Multiple mobiles numbers separated by comma
    $mobileNumber = $mobile;

//Sender ID,While using route4 sender id should be 6 characters long.
    $senderId = "IKOONK";

//Your message to send, Add URL encoding here.
    $message = urlencode($msg);

//Define route
    $route = "template";
//Prepare you post parameters
    $postData = array(
        'authkey' => $authKey,
        'mobiles' => $mobileNumber,
        'message' => $message,
        'sender' => $senderId,
        'route' => $route
    );

//API URL
    $url="https://control.msg91.com/sendhttp.php";

// init the resource
    $ch = curl_init();
    curl_setopt_array($ch, array(
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $postData
        //,CURLOPT_FOLLOWLOCATION => true
    ));


//Ignore SSL certificate verification
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);


//get response
    $output = curl_exec($ch);
//Print error if any
    if(curl_errno($ch))
    {
        echo 'error:' . curl_error($ch);
    }

    curl_close($ch);
}

//其中“$authKey = "XXXXXXXXXXX";”需要你输入你的密码，“$senderId = "IKOONK";
//”需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如，美国是 1，印度是 91 )。
//语法：
$message = "Hello World";
$mobile = "918112998787";
send_sms($mobile,$message);
?>

2. 使用 mandrill 发送邮件

Mandrill 是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。

下面的函数中，你需要把 “Mandrill.php” 放在同一个文件夹，作为 PHP 文件，这样就可以使用TA来发送邮件。

<?php

function send_email($to_email,$subject,$message1)
{
    require_once 'Mandrill.php';
    $apikey = 'XXXXXXXXXX'; //specify your api key here
    $mandrill = new Mandrill($apikey);

    $message = new stdClass();
    $message->html = $message1;
    $message->text = $message1;
    $message->subject = $subject;
    $message->from_email = "blog@koonk.com";//Sender Email
    $message->from_name  = "KOONK";//Sender Name
    $message->to = array(array("email" => $to_email));
    $message->track_opens = true;

    $response = $mandrill->messages->send($message);
}
//“$apikey = 'XXXXXXXXXX'; //specify your api key here”这里需要你指定你的 API 密钥（从 Mandrill 账户中获得）。
//为了达到最好的效果，最好按照 Mandrill 的教程去配置 DNS。
$to = "abc@example.com";
$subject = "This is a test email";
$message = "Hello World!";
send_email($to,$subject,$message);
?>

3. PHP 函数：阻止 SQL 注入

SQL 注入或者 SQLi 常见的攻击网站的手段，使用下面的代码可以帮助你防止这些工具。
<?php

function clean($input)
{
    if (is_array($input))
    {
        foreach ($input as $key => $val)
        {
            $output[$key] = clean($val);
            // $output[$key] = $this->clean($val);
        }
    }
    else
    {
        $output = (string) $input;
        // if magic quotes is on then use strip slashes
        if (get_magic_quotes_gpc())
        {
            $output = stripslashes($output);
        }
        // $output = strip_tags($output);
        $output = htmlentities($output, ENT_QUOTES, 'UTF-8');
    }
// return the clean text
    return $output;
}

//语法：
$text = "<script>alert(1)</script>";
$text = clean($text);
echo $text;
?>
4. 检测用户位置

使用下面的函数，可以检测用户是在哪个城市访问你的网站

<?php

function detect_city($ip) {

    $default = 'UNKNOWN';

    $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';

    $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
    $ch = curl_init();

    $curl_opt = array(
        CURLOPT_FOLLOWLOCATION  => 1,
        CURLOPT_HEADER      => 0,
        CURLOPT_RETURNTRANSFER  => 1,
        CURLOPT_USERAGENT   => $curlopt_useragent,
        CURLOPT_URL       => $url,
        CURLOPT_TIMEOUT         => 1,
        CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],
    );

    curl_setopt_array($ch, $curl_opt);

    $content = curl_exec($ch);

    if (!is_null($curl_info)) {
        $curl_info = curl_getinfo($ch);
    }

    curl_close($ch);

    if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) )  {
        $city = $regs[1];
    }
    if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) )  {
        $state = $regs[1];
    }

    if( $city!='' && $state!='' ){
        $location = $city . ', ' . $state;
        return $location;
    }else{
        return $default;
    }

}
//语法：

$ip = $_SERVER['REMOTE_ADDR'];
$city = detect_city($ip);
echo $city;
?>
5. 获取 Web 页面的源代码

使用下面的函数，可以获取任意 Web 页面的 HTML 代码

<?php

function display_sourcecode($url)
{
    $lines = file($url);
    $output = "";
    foreach ($lines as $line_num => $line) {
        // loop thru each line and prepend line numbers
        $output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n";
    }
}
//语法：
$url = "http://blog.koonk.com";
$source = display_sourcecode($url);
echo $source;
?>
6. 计算喜欢你的 Facebook 页面的用户
<?php
function fb_fan_count($facebook_name)
{
    $data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));
    $likes = $data->likes;
    return $likes;
}
//语法
$page = "koonktechnologies";
$count = fb_fan_count($page);
echo $count;
?>


7. 确定任意图片的主导颜色
<?php
function dominant_color($image)
{
    $i = imagecreatefromjpeg($image);
    for ($x=0;$x<imagesx($i);$x++) {
        for ($y=0;$y<imagesy($i);$y++) {
            $rgb = imagecolorat($i,$x,$y);
            $r   = ($rgb >> 16) & 0xFF;
            $g   = ($rgb >>  & 0xFF;
            $b   = $rgb & 0xFF;
            $rTotal += $r;
            $gTotal += $g;
            $bTotal += $b;
            $total++;
        }
    }
    $rAverage = round($rTotal/$total);
    $gAverage = round($gTotal/$total);
    $bAverage = round($bTotal/$total);
}

?>
8. whois 查询

使用下面的函数可以获取任何域名用户的完整细节

<?php

function whois_query($domain) {

    // fix the domain name:
    $domain = strtolower(trim($domain));
    $domain = preg_replace('/^http:\/\//i', '', $domain);
    $domain = preg_replace('/^www\./i', '', $domain);
    $domain = explode('/', $domain);
    $domain = trim($domain[0]);

    // split the TLD from domain name
    $_domain = explode('.', $domain);
    $lst = count($_domain)-1;
    $ext = $_domain[$lst];

    // You find resources and lists
    // like these on wikipedia:
    //
    // http://de.wikipedia.org/wiki/Whois
    //
    $servers = array(
        "biz" => "whois.neulevel.biz",
        "com" => "whois.internic.net",
        "us" => "whois.nic.us",
        "coop" => "whois.nic.coop",
        "info" => "whois.nic.info",
        "name" => "whois.nic.name",
        "net" => "whois.internic.net",
        "gov" => "whois.nic.gov",
        "edu" => "whois.internic.net",
        "mil" => "rs.internic.net",
        "int" => "whois.iana.org",
        "ac" => "whois.nic.ac",
        "ae" => "whois.uaenic.ae",
        "at" => "whois.ripe.net",
        "au" => "whois.aunic.net",
        "be" => "whois.dns.be",
        "bg" => "whois.ripe.net",
        "br" => "whois.registro.br",
        "bz" => "whois.belizenic.bz",
        "ca" => "whois.cira.ca",
        "cc" => "whois.nic.cc",
        "ch" => "whois.nic.ch",
        "cl" => "whois.nic.cl",
        "cn" => "whois.cnnic.net.cn",
        "cz" => "whois.nic.cz",
        "de" => "whois.nic.de",
        "fr" => "whois.nic.fr",
        "hu" => "whois.nic.hu",
        "ie" => "whois.domainregistry.ie",
        "il" => "whois.isoc.org.il",
        "in" => "whois.ncst.ernet.in",
        "ir" => "whois.nic.ir",
        "mc" => "whois.ripe.net",
        "to" => "whois.tonic.to",
        "tv" => "whois.tv",
        "ru" => "whois.ripn.net",
        "org" => "whois.pir.org",
        "aero" => "whois.information.aero",
        "nl" => "whois.domain-registry.nl"
    );

    if (!isset($servers[$ext])){
        die('Error: No matching nic server found!');
    }

    $nic_server = $servers[$ext];

    $output = '';

    // connect to whois server:
    if ($conn = fsockopen ($nic_server, 43)) {
        fputs($conn, $domain."\r\n");
        while(!feof($conn)) {
            $output .= fgets($conn,128);
        }
        fclose($conn);
    }
    else { die('Error: Could not connect to ' . $nic_server . '!'); }

    return $output;
}
//语法
$domain = "http://www.blog.koonk.com";
$result = whois_query($domain);
print_r($result);
?>

9. 验证邮箱地址

有时候，当在网站填写表单，用户可能会输入错误的邮箱地址，这个函数可以验证邮箱地址是否有效。

<?php

function is_validemail($email)
{
    $check = 0;
    if(filter_var($email,FILTER_VALIDATE_EMAIL))
    {
        $check = 1;
    }
    return $check;
}
//语法
$email = "blog@koonk.com";
$check = is_validemail($email);
echo $check;
// If the output is 1, then email is valid.
?>
10. 获取用户的真实  IP

<?php

function getRealIpAddr()
{
    if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))
    {
        $ip=$_SERVER['HTTP_CLIENT_IP'];
    }
    elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))
        //to check ip is pass from proxy
    {
        $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
    }
    else
    {
        $ip=$_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}
//语法
$ip = getRealIpAddr();
echo $ip;
?>
11. 转换 URL：从字符串变成超链接

如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。

<?php

function makeClickableLinks($text)
{
    $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',
        '<a href="\1">\1</a>', $text);
    $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',
        '\1<a href="http://\2">\2</a>', $text);
    $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',
        '<a href="mailto:\1">\1</a>', $text);

    return $text;
}

$text = "This is my first post on http://blog.koonk.com";
$text = makeClickableLinks($text);
echo $text;
?>

12. 阻止多个 IP 访问你的网站

这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站
<?php
if ( !file_exists('blocked_ips.txt') ) {
    $deny_ips = array(
        '127.0.0.1',
        '192.168.1.1',
        '83.76.27.9',
        '192.168.1.163'
    );
} else {
    $deny_ips = file('blocked_ips.txt');
}
// read user ip adress:
$ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

// search current IP in $deny_ips array
if ( (array_search($ip, $deny_ips))!== FALSE ) {
    // address is blocked:
    echo 'Your IP adress ('.$ip.') was blocked!';
    exit;
}
?>
13. 强制性文件下载

如果你需要下载特定的文件而不用另开新窗口，下面的代码片段可以帮助你。

<?php
function force_download($file)
{
    $dir      = "../log/exports/";
    if ((isset($file))&&(file_exists($dir.$file))) {
        header("Content-type: application/force-download");
        header('Content-Disposition: inline; filename="' . $dir.$file . '"');
        header("Content-Transfer-Encoding: Binary");
        header("Content-length: ".filesize($dir.$file));
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="' . $file . '"');
        readfile("$dir$file");
    } else {
        echo "No file selected";
    }
}
force_download("image.jpg");
?>
15. 压缩 zip 文件

使用下面的 PHP 片段可以即时压缩 zip 文件
<?php

function create_zip($files = array(),$destination = '',$overwrite = false) {
    //if the zip file already exists and overwrite is false, return false
    if(file_exists($destination) && !$overwrite) { return false; }
    //vars
    $valid_files = array();
    //if files were passed in...
    if(is_array($files)) {
        //cycle through each file
        foreach($files as $file) {
            //make sure the file exists
            if(file_exists($file)) {
                $valid_files[] = $file;
            }
        }
    }
    //if we have good files...
    if(count($valid_files)) {
        //create the archive
        $zip = new ZipArchive();
        if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
            return false;
        }
        //add the files
        foreach($valid_files as $file) {
            $zip->addFile($file,$file);
        }
        //debug
        //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;

        //close the zip -- done!
        $zip->close();

        //check to make sure the file exists
        return file_exists($destination);
    }
    else
    {
        return false;
    }
}

$files=array('file1.jpg', 'file2.jpg', 'file3.gif');
create_zip($files, 'myzipfile.zip', true);
?>
16. 解压文件

<?php
function unzip($location,$newLocation)
{
    if(exec("unzip $location",$arr)){
        mkdir($newLocation);
        for($i = 1;$i< count($arr);$i++){
            $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
            copy($location.'/'.$file,$newLocation.'/'.$file);
            unlink($location.'/'.$file);
        }
        return TRUE;
    }else{
        return FALSE;
    }
}

unzip('test.zip','unziped/test'); //File would be unzipped in unziped/test folder
?>
17. 缩放图片
<?php

function resize_image($filename, $tmpname, $xmax, $ymax)
{
    $ext = explode(".", $filename);
    $ext = $ext[count($ext)-1];

    if($ext == "jpg" || $ext == "jpeg")
        $im = imagecreatefromjpeg($tmpname);
    elseif($ext == "png")
        $im = imagecreatefrompng($tmpname);
    elseif($ext == "gif")
        $im = imagecreatefromgif($tmpname);

    $x = imagesx($im);
    $y = imagesy($im);

    if($x <= $xmax && $y <= $ymax)
        return $im;

    if($x >= $y) {
        $newx = $xmax;
        $newy = $newx * $y / $x;
    }
    else {
        $newy = $ymax;
        $newx = $x / $y * $newy;
    }

    $im2 = imagecreatetruecolor($newx, $newy);
    imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
    return $im2;
}

?>
18. 使用 mail() 发送邮件
之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段，但是如果你不想使用第三方服务，那么可以使用下面的 PHP 代码片段。
<?php

function send_mail($to,$subject,$body)
{
    $headers = "From: KOONK\r\n";
    $headers .= "Reply-To: blog@koonk.com\r\n";
    $headers .= "Return-Path: blog@koonk.com\r\n";
    $headers .= "X-Mailer: PHP5\n";
    $headers .= 'MIME-Version: 1.0' . "\n";
    $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
    mail($to,$subject,$body,$headers);
}

$to = "admin@koonk.com";
$subject = "This is a test mail";
$body = "Hello World!";
send_mail($to,$subject,$body);
?>
19. 把秒转换成天数，小时数和分钟

<?php

function secsToStr($secs) {
    if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
    if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
    if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
    $r.=$secs.' second';if($secs<>1){$r.='s';}
    return $r;
}

$seconds = "56789";
$output = secsToStr($seconds);
echo $output;
?>
21. 目录清单

使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

<?php

function list_files($dir)
{
    if(is_dir($dir))
    {
        if($handle = opendir($dir))
        {
            while(($file = readdir($handle)) !== false)
            {
                if($file != "." &amp;&amp; $file != ".." &amp;&amp; $file != "Thumbs.db"/*pesky windows, images..*/)
                {
                    echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
                }
            }
            closedir($handle);
        }
    }
}

list_files("images/"); //This will list all files of images folder
?>
22. 检测用户语言

使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

<?php

function get_client_language($availableLanguages, $default='en'){
    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
        foreach ($langs as $value){
            $choice=substr($value,0,2);
            if(in_array($choice, $availableLanguages)){
                return $choice;
            }
        }
    }
    return $default;
}

?>
23. 查看 CSV 文件
<?php

function readCSV($csvFile){
    $file_handle = fopen($csvFile, 'r');
    while (!feof($file_handle) ) {
        $line_of_text[] = fgetcsv($file_handle, 1024);
    }
    fclose($file_handle);
    return $line_of_text;
}

$csvFile = "test.csv";
$csv = readCSV($csvFile);
$a = csv[0][0]; // This will get value of Column 1 & Row 1
?>

24. 从 PHP 数据创建 CSV 文件

<?php

function generateCsv($data, $delimiter = ',', $enclosure = '"') {
    $handle = fopen('php://temp', 'r+');
    foreach ($data as $line) {
        fputcsv($handle, $line, $delimiter, $enclosure);
    }
    rewind($handle);
    while (!feof($handle)) {
        $contents .= fread($handle, 8192);
    }
    fclose($handle);
    return $contents;
}

$data[0] = "apple";
$data[1] = "oranges";
generateCsv($data, $delimiter = ',', $enclosure = '"');
?>
25. 解析 XML 数据

<?php

$xml_string="<?xml version='1.0'?>
<moleculedb>
    <molecule name='Benzine'>
        <symbol>ben</symbol>
        <code>A</code>
    </molecule>
    <molecule name='Water'>
        <symbol>h2o</symbol>
        <code>K</code>
    </molecule>
</moleculedb>";

//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);

//loop through the each node of molecule
foreach ($xml->molecule as $record)
{
    //attribute are accessted by
    echo $record['name'], '  ';
    //node are accessted by -> operator
    echo $record->symbol, '  ';
    echo $record->code, '<br />';
}

?>
26. 解析 JSON 数据

<?php

$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google

?>

27. 获取当前页面 URL

这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

<?php

function current_url()
{
    $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    $validURL = str_replace("&", "&amp;", $url);
    return validURL;
}
echo "Currently you are on: ".current_url();
?>

28. 从任意的 Twitter 账号获取最新的 Tweet
<?php
function my_twitter($username)
{
    $no_of_tweets = 1;
    $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
    $xml = simplexml_load_file($feed);
    foreach($xml->children() as $child) {
        foreach ($child as $value) {
            if($value->getName() == "link") $link = $value['href'];
            if($value->getName() == "content") {
                $content = $value . "";
                echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title="">&nbsp; </a></p>';
            }
        }
    }
}
$handle = "koonktech";
my_twitter($handle);
?>
29. 转发数量

使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量
<?php
function tweetCount($url) {
    $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url);
    $element = new SimpleXmlElement($content);
    $retweets = $element->story->url_count;
    if($retweets){
        return $retweets;
    } else {
        return 0;
    }
}
$url = "http://blog.koonk.com";
$count = tweetCount($url);
return $count;
?>
30. 计算两个日期的差
<?php
$date1 = date( 'Y-m-d' );
$date2 = "2015-12-04";
$diff = abs(strtotime($date2) - strtotime($date1));
$years = floor($diff / (365*60*60*24));
$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));
printf("%d years, %d months, %d days\n", $years, $months, $days);
-------------------------------------------------------- OR
$date1 = new DateTime("2007-03-24");
$date2 = new DateTime("2009-06-26");
$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days ";
// shows the total amount of days (not divided into years, months and days like above)
echo "difference " . $interval->days . " days ";
-------------------------------------------------------- OR


/**
 * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
 * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
 *
 * See here for original code:
 * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
 * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
 */
function _date_range_limit($start, $end, $adj, $a, $b, $result)
{
    if ($result[$a] < $start) {
        $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
        $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
    }
    if ($result[$a] >= $end) {
        $result[$b] += intval($result[$a] / $adj);
        $result[$a] -= $adj * intval($result[$a] / $adj);
    }
    return $result;
}
function _date_range_limit_days($base, $result)
{
    $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    _date_range_limit(1, 13, 12, "m", "y", &$base);
    $year = $base["y"];
    $month = $base["m"];
    if (!$result["invert"]) {
        while ($result["d"] < 0) {
            $month--;
            if ($month < 1) {
                $month += 12;
                $year--;
            }
            $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
            $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
            $result["d"] += $days;
            $result["m"]--;
        }
    } else {
        while ($result["d"] < 0) {
            $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
            $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
            $result["d"] += $days;
            $result["m"]--;
            $month++;
            if ($month > 12) {
                $month -= 12;
                $year++;
            }
        }
    }
    return $result;
}
function _date_normalize($base, $result)
{
    $result = _date_range_limit(0, 60, 60, "s", "i", $result);
    $result = _date_range_limit(0, 60, 60, "i", "h", $result);
    $result = _date_range_limit(0, 24, 24, "h", "d", $result);
    $result = _date_range_limit(0, 12, 12, "m", "y", $result);
    $result = _date_range_limit_days(&$base, &$result);
    $result = _date_range_limit(0, 12, 12, "m", "y", $result);
    return $result;
}
/**
 * Accepts two unix timestamps.
 */
function _date_diff($one, $two)
{
    $invert = false;
    if ($one > $two) {
        list($one, $two) = array($two, $one);
        $invert = true;
    }
    $key = array("y", "m", "d", "h", "i", "s");
    $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
    $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));
    $result = array();
    $result["y"] = $b["y"] - $a["y"];
    $result["m"] = $b["m"] - $a["m"];
    $result["d"] = $b["d"] - $a["d"];
    $result["h"] = $b["h"] - $a["h"];
    $result["i"] = $b["i"] - $a["i"];
    $result["s"] = $b["s"] - $a["s"];
    $result["invert"] = $invert ? 1 : 0;
    $result["days"] = intval(abs(($one - $two)/86400));
    if ($invert) {
        _date_normalize(&$a, &$result);
    } else {
        _date_normalize(&$b, &$result);
    }
    return $result;
}
$date = "2014-12-04 19:37:22";
echo '<pre>';
print_r( _date_diff( strtotime($date), time() ) );
echo '</pre>';
?>
31. 删除文件夹内容
<?php
function Delete($path)
{
    if (is_dir($path) === true)
    {
        $files = array_diff(scandir($path), array('.', '..'));
        foreach ($files as $file)
        {
            Delete(realpath($path) . '/' . $file);
        }
        return rmdir($path);
    }
    else if (is_file($path) === true)
    {
        return unlink($path);
    }
    return false;
}
$path = "images/";
Delete($path); // This will delete images folder along with its contents.
?>
32. 搜索和高亮字符串中的关键字
<?php
function highlighter_text($text, $words)
{
    $split_words = explode( " " , $words );
    foreach($split_words as $word)
    {
        $color = "#4285F4";
        $text = preg_replace("|($word)|Ui" ,
            "<span style=\"color:".$color.";\"><b>$1</b></span>" , $text );
    }
    return $text;
}
$string = "I like chocolates and I like apples";
$words = "apple";
echo highlighter_text($string ,$words);
?>
33. 写入文件
<?php
$filename = 'blog.csv';
$fp = fopen($filename, 'w');
$output = " Hello ";
$output .= " World! ";
$output .= "\r\n";
fputs($fp, $output);
fclose($fp);
?>
34. 根据 URL 下载图片
<?php
function imagefromURL($image,$rename)
{
    $ch = curl_init($image);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
    $rawdata=curl_exec ($ch);
    curl_close ($ch);
    $fp = fopen("$rename",'w');
    fwrite($fp, $rawdata);
    fclose($fp);
}
$url = "http://koonk.com/images/logo.png";
$rename = "koonk.png";
imagefromURL($url,$rename);
?>
35. 检测 URL 是否有效

<?php
function isvalidURL($url)
{
    $check = 0;
    if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
        $check = 1;
    }
    return $check;
}
$url = "http://koonk.com";
$check = checkvalidURL($url);
echo $check; //if returns 1 then URL is valid.
?>

36. 生成二维码
<?php
function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0')
{
    $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
    if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
    {
        $type = "TXT";
    }
    if (!preg_match('/^'.$types[$type].'/', $data))
    {
        $data = str_replace("\\", "", $types[$type]).$data;
    }
    $ch = curl_init();
    $data = urlencode($data);
    curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    $response = curl_exec($ch);
    curl_close($ch);
    return $response;
}
header("Content-type: image/png");
echo qr_code("http://koonk.com", "URL");
?>
37. 计算两个地图坐标之间的距离
<?php

function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
    $theta = $longitude1 - $longitude2;
    $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
    $miles = acos($miles);
    $miles = rad2deg($miles);
    $miles = $miles * 60 * 1.1515;
    $feet = $miles * 5280;
    $yards = $feet / 3;
    $kilometers = $miles * 1.609344;
    $meters = $kilometers * 1000;
    return compact('miles','feet','yards','kilometers','meters');
}

$point1 = array('lat' => 40.770623, 'long' => -73.964367);
$point2 = array('lat' => 40.758224, 'long' => -73.917404);
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
foreach ($distance as $unit => $value) {
    echo $unit.': '.number_format($value,4).'<br />';
}
?>
38. 获取一个特定话题标签的所有 Tweets
<?php
function getTweets($hash_tag) {
    $url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ;
    echo "<p>Connecting to <strong>$url</strong> ...</p>";
    $ch = curl_init($url);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
    $xml = curl_exec ($ch);
    curl_close ($ch);
    //If you want to see the response from Twitter, uncomment this next part out:
    //echo "<p>Response:</p>";
    //echo "<pre>".htmlspecialchars($xml)."</pre>";
    $affected = 0;
    $twelement = new SimpleXMLElement($xml);
    foreach ($twelement->entry as $entry) {
        $text = trim($entry->title);
        $author = trim($entry->author->name);
        $time = strtotime($entry->published);
        $id = $entry->id;
        echo "<p>Tweet from ".$author.": <strong>".$text."</strong>  <em>Posted ".date('n/j/y g:i a',$time)."</em></p>";
    }
    return true ;
}

?>
39. 添加 th,st,nd 或者 rd 作为数字的后缀
Friday the 13th
<?php
function ordinal($cdnl){
    $test_c = abs($cdnl) % 10;
    $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th'
        : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1)
            ? 'th' : 'st' : 'nd' : 'rd' : 'th'));
    return $cdnl.$ext;
}

$number = 10;
echo ordinal($number); //output is 10th
?>
40. 限制文件下载的速度
<?php
// local file that should be send to the client
$local_file = 'test-file.zip';
// filename that the user gets as default
$download_file = 'your-download-name.zip';

// set the download rate limit (=> 20,5 kb/s)
$download_rate = 20.5;
if(file_exists($local_file) && is_file($local_file)) {
    // send headers
    header('Cache-control: private');
    header('Content-Type: application/octet-stream');
    header('Content-Length: '.filesize($local_file));
    header('Content-Disposition: filename='.$download_file);

    // flush content
    flush();
    // open file stream
    $file = fopen($local_file, "r");
    while(!feof($file)) {

        // send the current file part to the browser
        print fread($file, round($download_rate * 1024));

        // flush the content to the browser
        flush();

        // sleep one second
        sleep(1);
    }

    // close file stream
    fclose($file);}
else {
    die('Error: The file '.$local_file.' does not exist!');
}
?>
41. 把文本转换成图片
<?php
header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button.png");
$color = imagecolorallocate($im, 255, 255, 255);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
$py = 9;
$fontSize = 1;
imagestring($im, fontSize, $px, $py, $string, $color);
imagepng($im);
imagedestroy($im);
?>
42. 获取远程文件的大小
<?php

function remote_filesize($url, $user = "", $pw = "")
{
    ob_start();
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    if(!empty($user) && !empty($pw))
    {
        $headers = array('Authorization: Basic ' .  base64_encode("$user:$pw"));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    $ok = curl_exec($ch);
    curl_close($ch);
    $head = ob_get_contents();
    ob_end_clean();
    $regex = '/Content-Length:\s([0-9].+?)\s/';
    $count = preg_match($regex, $head, $matches);
    return isset($matches[1]) ? $matches[1] : "unknown";
}

$file = "http://koonk.com/images/logo.png";
$size = remote_filesize($url);
echo $size;
?>
43. 使用 imagebrick 进行 pdf 到图像的转换
<?php
$pdf_file   = './pdf/demo.pdf';
$save_to    = './jpg/demo.jpg';     //make sure that apache has permissions to write in this folder! (common problem)
//execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);
if($return_var == 0) {              //if exec successfuly converted pdf to jpg
    print "Conversion OK";
}
else print "Conversion failed.<br />".$output;
?>
44. 使用 tinyurl 生成短网址

<?php

function get_tiny_url($url)
{
    $ch = curl_init();
    $timeout = 5;
    curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
}

$url = "http://blog.koonk.com/2015/07/Hello-World";
$tinyurl = get_tiny_url($url);
echo $tinyurl;
?>
45. youtube 下载链接生成器

使用下面的 PHP 片段可以让你的用户下载 Youtube 视频
<?php

function str_between($string, $start, $end)
{
    $string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }
function get_youtube_download_link(){
    $youtube_link = $_GET['youtube'];
    $youtube_page = file_get_contents($youtube_link);
    $v_id = str_between($youtube_page, "&video_id=", "&");
    $t_id = str_between($youtube_page, "&t=", "&");
    $flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id";
    $hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6";
    $mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18";
    $threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17";
    echo "\t\tDownload (right-click &gt; save as)&#58;\n\t\t";
    echo "<a href=\"$flv_link\">FLV</a>\n\t\t";
    echo "<a href=\"$hq_flv_link\">HQ FLV (if available)</a>\n\t\t";
    echo "<a href=\"$mp4_link\">MP4</a>\n\t\t";
    echo "<a href=\"$threegp_link\">3GP</a><br><br>\n";
}

?>
46. Facebook 样式的时间戳

Facebook (x mins age, y hours ago etc)

<?php

function nicetime($date)
{
    if(empty($date)) {
        return "No date provided";
    }

    $periods         = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
    $lengths         = array("60","60","24","7","4.35","12","10");

    $now             = time();
    $unix_date         = strtotime($date);

    // check validity of date
    if(empty($unix_date)) {
        return "Bad date";
    }
    // is it future date or past date
    if($now > $unix_date) {
        $difference     = $now - $unix_date;
        $tense         = "ago";

    } else {
        $difference     = $unix_date - $now;
        $tense         = "from now";
    }

    for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
        $difference /= $lengths[$j];
    }

    $difference = round($difference);

    if($difference != 1) {
        $periods[$j].= "s";
    }

    return "$difference $periods[$j] {$tense}";
}

$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago
?>

